简介:2.1 Prior to analysis by Method 7550, samples must be prepared for direct
aspiration. The method of sample preparation will vary according to the sample
matrix. Aqueous samples are subjected to the acid digestion proce简介:2.1 Prior to analysis by Method 7550, samples must be prepared for direct
aspiration. The method of sample preparation will vary according to the sample
matrix. Aqueous samples are subjected to the acid digestion procedure discussed
in this method. Sludge samples are prepared using the procedure described in
Method 3050. For samples containing oils, greases, or waxes, the procedure
described in Method 3040 may be applicable. Due to the very volatile nature of
some osmium compounds, the applicability of a method to a sample must be verified
by means of spiked samples or standard reference materials, or both.
2.2 Following the appropriate dissolution of the sample, a representative
aliquot is aspirated into a nitrous oxide/acetylene flame. The resulting
absorption of hollow cathode radiation will be proportional to the osmium
concentration. Background correction must be employed for all analyses.
2.3 The typical detection limit for this method is 0.3 mg/L; typical
sensitivity is 1 mg/L.详细>